BugFix: Can add new line at the bottom of table without exception after table was sorted
Bugfix for wrong column sorting: It can be reproduced by following steps:
1.) ensure there are many columns so that horizontal scrollbar appears
2.) scroll to the right
3.) sort a column via sort link in column header (for example the first visible column)
The table sorts the very first column, not the first visible column.
Created CNAME
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bugfix: numeric cels wrong rendering signed value
Fix for #645 horizontal scrolling

This fixes the case when the horizontal scroll bar will not allow you to scroll to see the last column when using fixed columns.
Bugfix: WalkontableDom.prototype.offset now returns offset relatively to the document also for position: fixed
Bugfix: methods `countVisibleRows` and `countVisibleCols` were broken since version 0.9.0
feature: initial release of Native Scrollbars feature (experimental, don't use yet)
remove redundant file
bugfix: mouse wheel didn't scroll the window when cursor was over Handsontable
remove waitsFor(nextFrame) from tests
bugfix: fix scrolling on border cases when table height was the size of the container
feature: initial release of `observeChanges` option
added new file CONTRIBUTING.md